WO2022143132A1

WO2022143132A1 - Battery box body and battery pack

Info

Publication number: WO2022143132A1
Application number: PCT/CN2021/137547
Authority: WO
Inventors: 王磊; 曹永强; 刘崇威; 李岩; 李树会; 单红艳
Original assignee: 长城汽车股份有限公司
Priority date: 2020-12-29
Filing date: 2021-12-13
Publication date: 2022-07-07
Also published as: CN112704832A

Abstract

A battery box body and a battery pack. The battery box body comprises: a housing, wherein a fire extinguishing channel is formed in the sidewall of the housing, and the sidewall of the housing is further provided with a fire outlet that is communicated with the fire extinguishing channel; a fire extinguishing box, wherein the fire extinguishing box is mounted at the fire outlet, and a fire extinguishing cavity communicated with the fire outlet is formed in the fire extinguishing box; and a spraying system, wherein the spraying system is used for selectively spraying a cooling liquid into the fire extinguishing cavity. The battery box body can achieve the directional discharge of a thermal runaway gas-fire flow, ensures the system pressure balance in the battery box body, and by providing the spraying system in the fire extinguishing box, can spray the cooling liquid into the fire extinguishing cavity, so that the cooling liquid is in contact with the thermal runaway gas-fire flow, thereby achieving the cooling of the thermal runaway gas-fire flow, prolonging the time of spraying open fire out of the battery pack, and improving the safety of the battery pack.

Description

Battery Cases and Battery Packs

This application claims the priority of the Chinese patent application with the application number 202011598046.X and the application name "Battery Case and Battery Pack", which was filed with the China Patent Office on December 29, 2020, the entire contents of which are incorporated herein by reference middle.

technical field

The present application relates to the technical field of battery manufacturing, and in particular, to a battery case and a battery pack having the battery case.

Background technique

With the rapid development of new energy vehicles, the battery pack is the core component of new energy vehicles, and its safety after thermal runaway has become an urgent engineering problem to be solved. When the cells in the battery pack are thermally out of control, the air pressure in the pack will increase sharply, and the flame or hot air will not need to be sprayed out. It may even threaten personnel safety, and there is room for improvement.

SUMMARY OF THE INVENTION

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, one purpose of the present application is to propose a battery box, which can realize the directional guidance of the thermal runaway gas-fire flow in the battery pack, and can spray the flame in the thermal runaway gas-fire flow to reduce the thermal runaway gas-fire flow temperature.

A battery box according to an embodiment of the present application includes: a casing, a side wall of the casing is provided with a fire extinguishing channel, and the side wall of the casing is further provided with a fire outlet communicating with the fire extinguishing channel; The fire extinguishing box is installed at the fire exhaust port, and the fire extinguishing box has a fire extinguishing cavity connected with the fire exhaust port; a spray system, the spray system is used to selectively face the fire extinguishing cavity. Spray coolant.

According to the battery box of the embodiment of the present application, the directional discharge of thermal runaway gas and fire flow can be realized, the system pressure in the battery box can be ensured, and the cooling liquid can be sprayed toward the fire-extinguishing cavity by arranging a spray system in the fire-extinguishing box. , so that the cooling liquid is in contact with the thermal runaway gas-fire flow, so as to realize the cooling and cooling of the thermal runaway gas-fire flow, prolong the time for the open flame to eject the battery pack, and improve the safety of the battery pack.

According to the battery case of some embodiments of the present application, the sprinkler system includes a sprinkler head, a temperature measurement element and a controller, the sprinkler head and the temperature measurement element are both installed in the fire extinguishing chamber, and the controller is used for According to the detection result of the temperature measuring element, the cooling liquid circulation state at the spray head is controlled.

The battery case according to some embodiments of the present application further includes: a driving device, wherein the driving device is installed in the housing, the spray head is connected to a liquid cooling system, and the controller is configured to control the driving device to drive the The cooling liquid in the liquid cooling system flows to the spray head.

According to the battery case of some embodiments of the present application, the liquid cooling system is installed in the casing and used to cool the battery module installed in the casing.

According to the battery case of some embodiments of the present application, the liquid cooling system and the spray head are communicated through a cooling pipeline, and a one-way valve is provided in the cooling pipeline, and the one-way valve is configured to The liquid cooling system is unidirectionally connected to the spray head.

According to the battery case of some embodiments of the present application, the driving device includes a driving motor provided in the battery case, and the driving motor is electrically connected to a water pump provided in the cooling pipeline.

The battery case according to some embodiments of the present application further includes: an external pipe port, the external pipe port is installed on the side wall, and the first end of the external pipe port is communicated with the fire extinguishing channel, and the The second end of the external pipe port is used for external cooling water circuit.

According to the battery case of some embodiments of the present application, the fire extinguishing box includes a fire inlet and a fire outlet, the fire inlet and the fire outlet are both communicated with the fire extinguishing cavity, and the fire inlet and the fire outlet are opposite to each other. Then, the fire outlet communicates the fire extinguishing chamber with the outside, and at least one of the fire inlet and the fire outlet is provided with the temperature measuring element.

According to the battery case of some embodiments of the present application, there are a plurality of the spray heads, the plurality of the spray heads are arranged in the fire extinguishing chamber at intervals, and the plurality of the spray heads are arranged to face the fire extinguishing from different directions respectively Spray coolant in the cavity.

The present application also proposes a battery pack.

According to the battery pack of the embodiment of the present application, the battery case of any of the above-mentioned embodiments is provided.

The advantages of the battery pack and the above-mentioned battery box are the same over the prior art, which will not be repeated here.

Additional aspects and advantages of the present application will be set forth, in part, from the following description, and in part will become apparent from the following description, or may be learned by practice of the present application.

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

2 is a schematic structural diagram of a casing of a battery pack according to an embodiment of the present application;

3 is a cross-sectional view of a casing of a battery pack according to an embodiment of the present application;

4 is a schematic structural diagram of a spray system of a battery pack according to an embodiment of the present application;

FIG. 5 is a top view of a casing and a battery module of a battery pack according to an embodiment of the present application.

Reference number:

battery pack 100;

Shell 1, fire extinguishing channel 11, sub-channel 111, air guide 12, fire extinguishing box 2;

Nozzle 31, temperature measuring element 32, controller 33, driving device 34, cooling pipeline 35, one-way valve 36, liquid cooling system 37;

Battery module 4 , directional explosion vent 41 , upper cover 5 , mica plate 6 .

Detailed ways

The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application.

The following describes a battery case according to an embodiment of the present application with reference to FIGS. 1 to 5 . The battery case is provided with a spray system for cooling and cooling the thermal runaway gas and fire flow in the fire extinguishing box 2 , which can make the thermal runaway gas fire flow. After being discharged from the fire extinguishing box 2 , the temperature is low, which will not cause serious damage to the equipment or personnel outside the battery pack 100 , which is beneficial to improve the use safety of the battery pack 100 .

As shown in FIGS. 1-5 , the battery box according to the embodiment of the present application includes: a casing 1 , a fire extinguishing box 2 and a spray system.

As shown in Figures 1 and 2, the casing 1 has an installation cavity, and the installation cavity is used to install the battery module 4. As shown in Figure 3, the side wall of the casing 1 is provided with a fire extinguishing channel 11 that communicates with the installation cavity. And as shown in Figures 3 and 4, the side wall of the casing 1 is also provided with a fire outlet.

It should be noted that, as shown in FIG. 1 , two groups of battery modules 4 can be installed in the installation cavity. The walls are provided with fire extinguishing channels 11, and two fire extinguishing boxes 2 are provided at the end of the housing 1. The two fire extinguishing channels 11 are spaced apart and communicated with the two fire extinguishing boxes 2 respectively. As shown in FIG. 1, the side walls are also There is an air guide port 12 facing the directional explosion vent 41 of the battery module 4. The air guide port 12 is used to connect the fire extinguishing channel 11 with the installation cavity. The air guide ports 12 of the two fire extinguishing channels 11 are respectively connected with two groups of battery modules. The directional explosion vents 41 of 4 are set facing each other, so that the thermal runaway gas and fire flow generated by the two groups of battery modules 4 can enter the corresponding fire extinguishing box 2 through the two fire extinguishing channels 11 respectively, so as to realize the effect of thermal runaway airflow discharge. , and seal the end of the fire extinguishing channel 11 away from the fire extinguishing box 2 to avoid cross flow between the two fire extinguishing channels 11 . As shown in FIG. 1 , the battery pack 100 further includes an upper cover 5 and a mica plate 6 . The upper cover 5 is suitable for being installed on the upper end of the casing 1 to seal the installation cavity, and the mica plate 6 is located between the upper cover 5 and the battery module. between 4.

That is to say, the battery module 4 can enter the fire extinguishing channel 11 after the high temperature thermal runaway gas and fire flow is generated in the installation cavity, and the temperature gradually decreases during the flow in the fire extinguishing channel 11 , and finally flows to the casing 1 . In the fire extinguishing box 2 at the end, so that the thermal runaway gas and fire flow after a certain degree of cooling enters into the fire extinguishing box 2 to achieve cooling and fire extinguishing treatment, effectively avoiding the problem of secondary combustion caused by the discharge of the outside gas with flame. The casing 1 may be made of aluminum alloy profiles. As shown in FIG. 3 , the fire extinguishing channel 11 is provided with partition ribs, and the partition ribs divide the fire extinguishing channel 11 into a plurality of subchannels 111 spaced apart in the up-down direction.

As shown in FIG. 1 , the fire extinguishing box 2 is installed at the fire outlet, and the fire extinguishing box 2 has a fire extinguishing cavity communicated with the fire exhaust port. The fire extinguishing cavity connects the fire inlet and the fire outlet of the fire extinguishing box 2. It should be noted that the fire extinguishing box 2 The fire inlet is communicated with the fire outlet, so that the thermal runaway air flow in the fire extinguishing channel 11 can be discharged through the fire outlet and enter the fire extinguishing chamber from the fire inlet, and after cooling and extinguishing the fire in the fire extinguishing chamber, the fire outlet is discharged out of the fire extinguishing box 2. Among them, an explosion-proof valve can be provided at the fire outlet of the fire-extinguishing box 2, and the explosion-proof valve can be opened when the air pressure in the fire-extinguishing box 2, the fire-extinguishing channel 11 and the installation cavity is too large, so as to discharge the explosion in time, thereby ensuring the battery box The internal pressure of the system in the body is in a state of equilibrium.

Among them, the spray system is used to selectively spray the cooling liquid toward the fire extinguishing chamber, that is to say, when the thermal runaway gas and fire flow flows through the fire extinguishing chamber, the cooling liquid can be sprayed toward the fire extinguishing chamber through the spray system. So that the cooling liquid is in contact with the thermal runaway gas-fire flow, so as to realize the cooling and cooling of the thermal runaway gas-fire flow.

Among them, the opening state of the sprinkler system can be controlled according to the temperature in the fire extinguishing chamber. For example, when the temperature of the thermal runaway gas and fire flow in the fire extinguishing chamber is too high and exceeds the preset temperature value, the sprinkler system is controlled to open, so that the spray The spray system sprays the cooling liquid toward the fire extinguishing chamber, so that the temperature of the thermal runaway gas and fire flow is reduced to below the preset temperature value, so that the flame of the gas fire flow entering the fire extinguishing box 2 or the temperature of the high-pressure air flow is effectively reduced , delaying the time for the flame to finally spray out of the battery pack 100, giving more escape time for the occupants in the vehicle, and improving the thermal runaway safety of the whole vehicle. When the temperature of the thermal runaway air and fire flow in the fire extinguishing chamber is low and lower than the preset temperature value, the air flow in the fire extinguishing box 2 will not cause damage to external personnel after flowing out, and the control sprinkler system is in a closed state. Therefore, it is beneficial to reduce the power consumption of the spray system and reduce the use cost of the spray system.

According to the battery box of the embodiment of the present application, the directional discharge of thermal runaway gas and fire flow can be realized, and the system pressure in the battery box can be ensured to be balanced, and by setting the spray system in the fire extinguishing box 2, it can be sprayed and cooled toward the fire extinguishing cavity. The cooling liquid is in contact with the thermal runaway gas-fire flow, thereby realizing the cooling and cooling of the thermal runaway gas-fire flow, prolonging the time for the open flame to spray out of the battery pack 100 , and improving the safety of the battery pack 100 .

In some embodiments, as shown in FIG. 4 , the sprinkler system includes a sprinkler head 31, a temperature measuring element 32 and a controller 33, the sprinkler head 31 and the temperature measuring element 32 are both installed in the fire extinguishing chamber, and the controller 33 is used to measure The detection result of the temperature element 32 controls the operation state of the spray head 31 .

Among them, as shown in FIG. 4 , the temperature measuring element 32 is installed in the fire extinguishing chamber to detect the temperature of the thermal runaway gas and fire flow in the fire extinguishing chamber to determine whether the thermal runaway gas fire flow meets the conditions for opening the sprinkler system. The sprinkler head 31 It is installed in the fire extinguishing cavity, and the nozzle 31 is used to spray cooling liquid toward the fire extinguishing cavity.

The controller 33 is electrically connected to the temperature measuring element 32. After the temperature measuring element 32 detects the temperature in the fire extinguishing chamber, it can transmit the detected temperature signal to the controller 33, and the controller 33 judges and analyzes the temperature signal, And based on the control logic, the operating state of the sprinkler head 31 is controlled, so that when the temperature in the fire extinguishing chamber is detected to be too high, the sprinkler head 31 is controlled to spray toward the fire extinguishing chamber, so as to realize the cooling effect of the thermal runaway gas and fire flow and reduce the high pressure gas. and flame temperature. The temperature measuring element 32 may be a temperature sensor.

It should be noted that the controller 33 can be integrated into the battery pack controller, so as to quickly make a control response when the battery pack 100 is thermally out of control, and no separate control device is required, which is beneficial to reduce costs.

In some embodiments, as shown in FIG. 4 , the spray system further includes a drive device 34 , the drive device 34 is installed in the housing 1 , the spray head 31 is connected to the liquid cooling system 37 , and the controller 33 is used to control the drive device 34 The cooling liquid in the driving liquid cooling system 37 flows to the spray head 31 . That is to say, the controller 33 can control the flow state of the cooling liquid between the liquid cooling system 37 and the spray head 31 through the driving device 34, so as to realize the cooling and cooling effect on the thermal runaway gas and fire flow.

In some embodiments, the liquid cooling system 37 is installed in the casing 1, and the liquid cooling system 37 is used to cool the battery module installed in the casing 1, so that the supply of the cooling liquid of the spray head 31 and the battery The supply of the cooling liquid of the module can use the same water source, so that there is no need to separately set up another water storage device, thereby reducing the installation cost.

Wherein, the driving device 34 can be integrated in the casing 1 of the battery box, so that the distance between the driving device 34 and the liquid cooling system 37 is short, which is beneficial to rapidly drive the cooling liquid toward the direction of the cooling liquid after the driving device 34 receives the control signal. The spray head 31 flows, which improves the response efficiency of the driving device 34 and ensures that the spray system sprays the cooling liquid in the fire extinguishing chamber in time.

In some embodiments, as shown in FIG. 4 , the liquid cooling system 37 is communicated with the spray head 31 through a cooling line 35 penetrating the side wall, and a check valve 36 is provided in the cooling line 35 , and the check valve 36 is configured as One-way flow from the liquid cooling system 37 to the spray head 31 .

In this way, through the setting of the check valve 36, the cooling liquid in the liquid cooling system 37 can flow to the nozzle 31 in one direction through the cooling pipeline 35, so as to ensure the effective cooling of the thermal runaway gas and fire flow, avoid cooling The liquid flows back into the liquid cooling system 37 . At the same time, it can be understood that after the thermal runaway gas and fire flow enters the fire extinguishing cavity, the air pressure in the fire extinguishing cavity increases. The uncontrolled gas and fire flow enters the liquid cooling system 37 under the action of air pressure, causing the pressure in the pipeline of the cooling system to be too large, thereby ensuring that the spray system is in a safe and stable operation state.

The one-way valve 36 may be an electromagnetic one-way valve 36 , and the one-way valve 36 is electrically connected to the controller 33 , so that the controller 33 drives the one-way valve 36 to open or close.

In some embodiments, the driving device 34 includes a driving motor provided in the battery box, the driving motor is electrically connected with the water pump provided in the cooling pipeline 35 , and the controller 33 is electrically connected with the driving motor, so that the controller 33 can The control signal is output to the drive motor, so that the drive motor can drive the water pump in the cooling pipeline 35, and the water pump drives the cooling liquid in the liquid cooling system 37 to flow toward the nozzle 31, and the drive motor can be powered by the battery module 4 , there is no need to increase the power supply separately, which is conducive to reducing costs.

Alternatively, the driving device 34 may also include an air pressure driving line, and the air pressure driving line is connected with the cooling line 35 for supplying driving air pressure to the cooling line 35, and the driving of the cooling liquid can also be realized.

In other embodiments, the battery pack further includes: an external pipe port, the external pipe port is installed on the side wall, the first end of the external pipe port is communicated with the fire extinguishing channel 11, and the second end of the external pipe port is used for external cooling waterway. That is to say, in the present application, an external pipe port can also be installed at the side wall, so that the cooling water in the external cooling water circuit can be introduced into the fire extinguishing channel 11 through the external pipe port, and the air and fire flow in the fire extinguishing channel 11 can be directly cooled. .

Therefore, in the battery pack in the present application, when the thermal runaway occurs in the battery module 4, the gas-fire flow generated by the battery module 4 enters the fire extinguishing channel 11, and can firstly be cooled by the cooling water at the external nozzle. After the gas and fire flow enters the fire extinguishing box 2, the cooling liquid in the cooling plate of the cooling system 37 flows to the nozzle 31 through the cooling pipeline 35 under the action of the driving motor, and enters the fire extinguishing box 2 to prevent the gas fire This can greatly reduce the flame in the gas and fire flow, delay the time for the flame to finally spray out of the battery pack 100, give the occupants more time to escape, and improve the thermal runaway of the vehicle. safety.

In some embodiments, the fire extinguishing box 2 includes a fire inlet and a fire outlet. Both the fire inlet and the fire outlet communicate with the fire extinguishing chamber, and the fire inlet and the fire outlet are connected. The fire outlet communicates the fire extinguishing chamber with the outside. At least one of the temperature measuring elements 32 are provided.

That is to say, the temperature measuring element 32 can be installed at the fire inlet or the fire outlet, or both the fire inlet and the fire outlet can be installed on the temperature measuring element 32 to realize the detection of the temperature in the fire extinguishing chamber. Of course, it can also be Select a plurality of temperature measuring elements 32, so that the plurality of temperature measuring elements 32 can detect the temperature in the fire extinguishing chamber at the same time, and the controller 33 comprehensively analyzes and judges according to the detection results of the plurality of temperature measuring elements 32, so as to obtain the fire extinguishing effect more accurately. actual temperature in the cavity.

In some embodiments, there are a plurality of spray heads 31 , the plurality of spray heads 31 are arranged in the fire extinguishing cavity at intervals, and the plurality of spray heads 31 are arranged to spray cooling liquid toward the fire extinguishing cavity from different directions respectively. For example, a plurality of spray heads 31 are respectively fixed and installed in a plurality of side walls of the fire extinguishing chamber. Specifically, the spray heads 31 may be arranged on the upper side wall, the lower side wall and the circumferential side wall of the fire extinguishing chamber, so as to increase the protection against thermal runaway gas fire. The cooling effect of the flow can effectively reduce the temperature of the flame or high-pressure airflow entering the fire extinguishing box 2, delay the time for the flame to finally spray out of the battery pack 100, give more escape time for the occupants in the vehicle, and improve the thermal runaway of the whole vehicle. safety.

The present application also proposes a battery pack 100 .

According to the battery pack 100 of the embodiment of the present application, the battery box of any of the above-mentioned embodiments is provided, which can realize the directional discharge of thermal runaway gas and fire flow, ensure the system pressure balance in the battery box, and pass through the fire extinguishing box 2 . A spray system is set up to spray coolant toward the fire-extinguishing chamber, so that the coolant contacts with the thermal runaway gas-fire flow, thereby cooling and cooling the thermal runaway gas-fire flow, and prolonging the time for the open flame to spray out of the battery pack 100. The safety of the battery pack 100 is improved.

It should be noted that a blocking structure is provided at the end of the side wall of the casing 1 away from the fire extinguishing box 2 to separate the fire extinguishing passages on both sides of the casing 1. As shown in FIG. The left side (such as k1) and the right position (such as k2) of one end of the side wall away from the fire extinguishing box 2 are provided with blocking structures to separate the fire extinguishing channels 11 on both sides and avoid the two sides of the battery box. Side air flow stream.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations on this application.

In the description of this application, "first feature" and "second feature" may include one or more of the features.

In the description of this application, "plurality" means two or more.

In the description of this application, a first feature being "above" or "under" a second feature may include that the first and second features are in direct contact, or that the first and second features are not in direct contact but through them Additional feature contacts between.

In the description of this application, the first feature "above", "over" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is level higher than Second feature.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples", etc., is meant to incorporate the embodiments A particular feature, structure, material, or characteristic described by an example or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the present application, The scope of the application is defined by the claims and their equivalents.

Claims

A battery box is characterized in that, comprising:

A casing (1), a fire extinguishing passage (11) is provided in the side wall of the casing (1), and a fire outlet communicating with the fire extinguishing passage (11) is further provided on the side wall of the casing (1) ;

a fire extinguishing box (2), the fire extinguishing box (2) is installed at the fire exhaust port, and the fire extinguishing box (2) has a fire extinguishing cavity in communication with the fire exhaust port;

A spray system, the spray system is used for selectively spraying cooling liquid toward the fire extinguishing cavity.
The battery box according to claim 1, characterized in that, the spray system comprises a spray head (31), a temperature measuring element (32) and a controller (33), the spray head (31) and the temperature measuring The elements (32) are all installed in the fire extinguishing chamber, and the controller (33) is used to control the cooling liquid circulation state at the nozzle (31) according to the detection result of the temperature measuring element (32). .
The battery box according to claim 2, further comprising: a driving device (34), the driving device (34) being installed in the casing (1), the spray head (31) being connected to the liquid A cooling system (37) is connected, and the controller (33) is configured to control the driving device (34) to drive the cooling liquid in the liquid cooling system (37) to flow to the spray head (31).
The battery box according to claim 3, characterized in that the liquid cooling system (37) is installed in the casing (1) and is used for cooling the battery mold installed in the casing (1). Group (4) was cooled.
The battery case according to claim 3, characterized in that, the liquid cooling system (37) and the spray head (31) are communicated through a cooling pipeline (35), and the cooling pipeline (35) ) is provided with a one-way valve (36), and the one-way valve (36) is configured to conduct unidirectionally from the liquid cooling system (37) to the spray head (31).
The battery box according to claim 5, characterized in that, the driving device (34) comprises a driving motor provided in the battery box, and the driving motor is connected with the cooling pipeline (35) electrical connection of the water pump.
The battery box according to any one of claims 1-2, further comprising: an outer pipe port, the outer pipe port is mounted on the side wall, and the first end of the outer pipe port is It is communicated with the fire extinguishing channel (11), and the second end of the external pipe port is used for external cooling water circuit.
The battery box according to any one of claims 2-7, characterized in that the fire extinguishing box (2) comprises a fire inlet and a fire outlet, and the fire inlet and the fire outlet are both connected with the fire extinguishing cavity and the fire inlet and the fire outlet are connected, the fire outlet communicates the fire extinguishing chamber with the outside, and at least one of the fire inlet and the fire outlet is provided with the temperature measuring element (32 ).
The battery case according to any one of claims 2-7, characterized in that, there are a plurality of the spray heads (31), and the plurality of the spray heads (31) are arranged in the fire extinguishing chamber at intervals, and The plurality of spray heads (31) are arranged to spray cooling liquid toward the fire extinguishing chamber from different directions respectively.
The battery box according to claim 4, characterized in that, the side wall is provided with an air guide port (12) facing the directional explosion discharge port (41) of the battery module (4). The air port (12) is used to communicate the fire extinguishing channel (11) with the installation cavity.
The battery box according to claim 1, wherein the fire extinguishing channel (11) is provided with a partition rib, and the partition rib divides the fire extinguishing channel (11) into a plurality of subsections spaced in the up-down direction. channel (111).
The battery box according to claim 9, characterized in that, the controller (33) controls the cooling liquid between the liquid cooling system (37) and the spray head (31) through the driving device (34). flow state is controlled.
The battery box according to claim 12, wherein the controller (33) controls the spraying when the temperature of the thermal runaway gas and fire flow in the fire extinguishing chamber is too high and exceeds a preset temperature value. The sprinkler system is turned on; when the temperature of the thermal runaway gas and fire flow in the fire extinguishing chamber is low and lower than the preset temperature value, the sprinkler system is controlled to be in a closed state.
The battery case according to claim 12, characterized in that, the driving device (34) also comprises a pneumatic driving pipeline, and the pneumatic driving pipeline is connected with a cooling pipeline (35) for cooling toward the cooling pipeline. The pipeline (35) provides the driving air pressure to realize the driving of the cooling liquid.
A battery pack (100), characterized in that the battery case according to any one of claims 1-14 is provided.